Ensure that the variable power supply is turned off and that the output voltage
knob is turned to its lowest limit.
2. Connect the power supply to the two
3. Turn on the power supply and slowly increase the voltage until
all of the lights are just lit. Leave the voltage at this level and do not adjust
it further for this black box. Keep the voltage constant at this value throughout
4. Selectively unscrew the light bulbs to determine which
of them are connected in series and which in parallel.
5. After ascertaining
how the light bulbs are connected, complete a circuit diagram.
6. Turn the
voltage down on the variable power supply and turn it off.
the leads from black box 1 and proceed to analyse in a similar fashion the remaining
8. After completing the circuit diagrams for all five Black
Boxes immediately have one member of the team take the diagrams to the judges.
Ensure that before leaving your test area that it is as you found it. The power
supply should be turned off and down. It should not be connected to any of the
black boxes. The area should be neat and tidy.